What actor always plays the same character in every movie?

Tom Cruise certainly stands out as the model.

John Wayne. He did it very well though

Hugh grant
Colin firth
Liam Neeson
Dwayne Johnson

Matthew McConaughey
Brad Pitt
Tom Cruise
Adam Sandler
Dwayne Johnson

DeNiro
Pacino
Pesci
Stallone

Jason Statham & Dwayne Johnson although I give the edge to Jason because he's perfected a style that is currently far more marketable than Dwayne's. Jason is far more self aware though, he and Michelle Rodriguez are aware of being typecast. If I recall correctly, Michelle basically alluded to that being intentional.

Nicolas Gob. Every movie, every TV series. It's ridiculous. He also always looks the same.

Its called type casting and some have made a good career by playing the same sort character repeatedly. Another way of looking at it is to say that the actor is poor and has no range so cannot get alternative roles.